You know I have always wondered, why did Advent debut specifically with Rebellion and the song main theme is light the fire when you have a rock, a crow, a booknerd and 2 fluffy dogs, none of them are have fire related power like kiara, they break out of the prison, why are they lighting fires? Who are they rebelling against? The prison guards? But none of them were shown in the MV. But when you goes into the song lyrics and given all we now know, it's started to make a lot of sense:
Come pull me out (of nijisanji). I'm out of sheep to count ($200K)
This overkill of sad old story is wearing me down (an hero)
Snap out of the system (the corpo system)
Break out! Give it everything (break out become an indie)
Blue sky, take us home (where do birds lives, blue skies)
To where we belong
And free us from the night (black company)
Take us to paradise
Fire, fire, light the fire (to the yacht)
Brighter, higher, as you desire (let the entire EN community knows)
One step to the left, Two steps to the right, Then back to where we started, and then over again
(Covers here, tournaments there, but back to 0$ profit and started all over again as a new vtuber identity - dokibird)
Tl;dr, whole thing was planned, sleeper agent L was activated when given the rebellion command from Yagoo.